28724970 has 16 divisors (see below), whose sum is σ = 68940000. Its totient is φ = 7659984.

The previous prime is 28724963. The next prime is 28724981. The reversal of 28724970 is 7942782.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478720 + ... + 478779.

It is an arithmetic number, because the mean of its divisors is an integer number (4308750).

Almost surely, 2^28724970 is an apocalyptic number.

28724970 is an abundant number, since it is smaller than the sum of its proper divisors (40215030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28724970 is a wasteful number, since it uses less digits than its factorization.

28724970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957509.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 28724970 is about 5359.5680796124. The cubic root of 28724970 is about 306.2573553696.

The spelling of 28724970 in words is "twenty-eight million, seven hundred twenty-four thousand, nine hundred seventy".